You can configure WLBS to load balance on multiple servers filtered to use single affinity, no affinity, or Class C. The best choice for Windows Media Server servers, which is a non-stateless application, is single affinity. When configured for single affinity, all incoming packets using the WLBS virtual IP address are locked to a specific node in the WLBS cluster. Every packet that is sent from the client using the cluster IP address connects to that node.